SIST EN 300 175-4 V2.9.1:2022
(Main)Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 4: Data Link Control (DLC) layer
General Information
- Abstract
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications
(DECT) Common Interface (CI).
The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard
and layer 2b of the DECT protocol stack.
Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and
the User plane (U-plane).
The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that
uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also
provides a separate point-to-multipoint (broadcast) service (Lb).
The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent
procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of
independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed
characteristics of those links are determined by the particular needs of each service. The defined services cover a wide
range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable
delay", for local area network applications.
NOTE: The performance of the DLC services need not be tight to any particular application. For example the
"unprotected with low delay" service could also be used for data applications, e.g. if some data protection
is provided outside the DECT protocol.
The present document uses the layered model principles and terminology as described in Recommendations ITU-T
X.200 [14] and X.210 [15].
The present document includes New Generation DECT, a further development of the DECT standard introducing
wideband speech, improved data services, new slot types and other technical enhancements.
- Status
- Published
- Public Enquiry End Date
- 22-Mar-2022
- Publication Date
- 05-Apr-2022
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 04-Apr-2022
- Due Date
- 09-Jun-2022
- Completion Date
- 06-Apr-2022
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ETSI EN 300 175-4 V2.8.5 (2021-12) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
ETSI EN 300 175-4 V2.9.1 (2022-03) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
Overview
SIST EN 300 175-4 V2.9.1:2022 focuses on the Data Link Control (DLC) layer within the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI) standard. As Part 4 of the DECT CI series, this standard defines how reliable and efficient communication is achieved between DECT devices at the data link layer, aligning with international telecommunications models such as ITU-T X.200 and X.210. The DLC layer serves as a key component of the DECT protocol stack (layer 2b), facilitating both control and user data exchanges in a secure and standardized manner.
Key Topics
- Data Link Control (DLC) Layer Functions: Establishes essential mechanisms for error-protected data transmission and network signaling over DECT radio channels.
- C-plane and U-plane Operations:
- C-plane (Control Plane): Manages DECT signaling, ensures reliable point-to-point and point-to-multipoint (broadcast) communication, and provides error protection for higher-layer messages.
- U-plane (User Plane): Handles end-to-end user information transfer, supporting various services tailored to application requirements, including both circuit-mode and packet-mode data links.
- Service Diversity: Enables a range of performance profiles, from low-delay unprotected connections suitable for voice, to highly protected connections designed for data-intensive applications such as local area networking.
- Layered Model: Applies OSI model principles to ensure interoperability, modularity, and adherence to global communication standards.
- New Generation DECT Enhancements: Supports modern features like wideband speech, improved data service capabilities, new slot types, and advanced technical enhancements, promoting future-ready cordless communications.
Applications
The practical value of SIST EN 300 175-4 V2.9.1:2022 is evident across various industries and use cases:
- Residential and Enterprise Cordless Telephony: Ensures robust and reliable communication within homes, offices, and large campuses by standardizing device interactions over the DECT interface.
- Wireless Data Networking: Facilitates secure, high-performance transmission of user and control data for local area and in-building networks.
- Healthcare and Industrial Automation: Provides the foundation for reliable, interference-resistant wireless communication essential for patient monitoring systems and industrial telemetry.
- Public and Private Mobility Services: Supports seamless handover, secure signaling, and efficient link management, crucial for applications requiring roaming between base stations or high user mobility.
- Broadband & Wideband Services: Underpins the evolution to higher bandwidth applications and wideband audio, supporting modern requirements for clear voice and data transmission.
Related Standards
To maximize compliance and system interoperability, the following related standards are essential:
- SIST EN 300 175-1: DECT - Common Interface (CI) - Part 1: Overview and general requirements
- SIST EN 300 175-2: DECT - Common Interface (CI) - Part 2: Physical Layer (PHL)
- SIST EN 300 175-3: DECT - Common Interface (CI) - Part 3: Medium Access Control (MAC) layer
- ITU-T X.200 / X.210: Reference model for Open Systems Interconnection (OSI)
- Associated DECT Profiles and ETSI EN 300 444: For service definition and performance across diverse services
Conclusion
SIST EN 300 175-4 V2.9.1:2022 is an essential standard for implementing and operating DECT-based communication systems. By standardizing the data link control functions, it ensures interoperability, security, and high quality of service for both control signals and user data. Its adoption across industries supports flexible, modern, and future-proof wireless communication solutions.
Keywords: DECT, Data Link Control, DLC, Common Interface, wireless communications, C-plane, U-plane, mobility, TDD, TDMA, broadband, wideband, radio, signaling, protocol stack, standardized communications.
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ETSI EN 300 175-4 V2.8.5 (2021-12) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
ETSI EN 300 175-4 V2.9.1 (2022-03) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
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Frequently Asked Questions
SIST EN 300 175-4 V2.9.1:2022 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 4: Data Link Control (DLC) layer". This standard covers: The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard and layer 2b of the DECT protocol stack. Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and the User plane (U-plane). The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also provides a separate point-to-multipoint (broadcast) service (Lb). The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed characteristics of those links are determined by the particular needs of each service. The defined services cover a wide range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable delay", for local area network applications. NOTE: The performance of the DLC services need not be tight to any particular application. For example the "unprotected with low delay" service could also be used for data applications, e.g. if some data protection is provided outside the DECT protocol. The present document uses the layered model principles and terminology as described in Recommendations ITU-T X.200 [14] and X.210 [15]. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements.
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard and layer 2b of the DECT protocol stack. Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and the User plane (U-plane). The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also provides a separate point-to-multipoint (broadcast) service (Lb). The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed characteristics of those links are determined by the particular needs of each service. The defined services cover a wide range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable delay", for local area network applications. NOTE: The performance of the DLC services need not be tight to any particular application. For example the "unprotected with low delay" service could also be used for data applications, e.g. if some data protection is provided outside the DECT protocol. The present document uses the layered model principles and terminology as described in Recommendations ITU-T X.200 [14] and X.210 [15]. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements.
SIST EN 300 175-4 V2.9.1:2022 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT); 35.100.20 - Data link layer. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 175-4 V2.9.1:2022 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
ETSI EN 300 175-4 V2.8.5 (2021-12)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
2 ETSI EN 300 175-4 V2.8.5 (2021-12)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
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All rights reserved.
ETSI
3 ETSI EN 300 175-4 V2.8.5 (2021-12)
Contents
Intellectual Property Rights . 13
Foreword . 13
Modal verbs terminology . 13
1 Scope . 14
2 References . 14
2.1 Normative references . 14
2.2 Informative references . 15
3 Definition of terms, symbols and abbreviations . 16
3.1 Terms . 16
3.2 Symbols . 16
3.3 Abbreviations . 17
4 Data Link Control (DLC) layer overview . 19
4.1 General . 19
4.2 C-plane services . 20
4.3 U-plane services . 21
4.4 Lower Layer Management Entity (LLME) . 24
4.5 Instantiation in DLC U-plane . 24
5 C-plane service characteristics . 24
5.1 Data link service (LAPC+Lc) . 24
5.1.1 General . 24
5.1.2 LAPC types of operation . 25
5.1.3 Establishment of information transfer modes . 25
5.1.3.1 Data Link Identifier (DLI) . 25
5.1.3.2 LAPC states. 26
5.2 Broadcast service (Lb) . 26
6 Frame structures for C-plane services . 27
6.1 Data link service frame structure . 27
6.1.0 Frame format type FA. 27
6.1.1 General frame structure . 27
6.1.2 Lc frame delimiting and transparency . 28
6.1.3 Transmission order . 28
6.1.4 Routing to logical channels . 28
6.1.4.0 General . 28
6.1.4.1 C /CL logical channel . 29
F F
6.1.4.2 C /CL logical channel . 29
S S
6.1.5 Invalid frames . 29
6.2 Broadcast service frame structure. 30
6.2.1 Standard frame structure . 30
6.2.2 Extended frame structure . 30
7 Elements of procedures and formats of fields for C-plane peer-to-peer communication . 31
7.1 General . 31
7.2 Address field formats . 31
7.3 Address field parameters . 31
7.3.1 REServed bit (RES) . 31
7.3.2 Command Response (C/R) bit . 31
7.3.3 SAPI field . 31
7.3.4 New Link Flag (NLF) bit . 32
7.3.5 LLN-field . 32
7.3.6 Data Link Identifiers (DLI) . 32
7.4 Control field formats . 33
7.5 Control field parameters . 33
7.5.1 Poll/Final (P/F) bit . 33
ETSI
4 ETSI EN 300 175-4 V2.8.5 (2021-12)
7.5.2 Multiple frame operation variables and sequence numbers . 33
7.5.2.1 Modulus . 33
7.5.2.2 Send state Variable V(S) . 34
7.5.2.3 Acknowledge state Variable V(A) . 34
7.5.2.4 Send sequence Number N(S) . 34
7.5.2.5 Receive state Variable V(R) . 34
7.5.2.6 Receive sequence Number N(R) . 34
7.5.3 Unacknowledged operation variables and sequence numbers . 34
7.5.4 Supervisory and Unnumbered function bits S and U . 34
7.6 Length indicator field format. 34
7.7 Length indicator field parameters . 35
7.7.1 Length indicator field extension bit (N) . 35
7.7.2 More data bit (M) . 35
7.7.3 Length parameter (L ) . 35
I
7.7.4 Extended length parameter (L ) . 36
JJ
7.7.5 Reserved bit (RES) . 36
7.8 Fill field format . 36
7.9 Checksum field format . 36
7.10 Checksum field parameters . 37
7.11 Commands and responses . 38
7.11.0 General . 38
7.11.1 Information (I) command . 38
7.11.2 Receive Ready (RR) command/response . 38
7.11.3 Receive Not Ready (RNR) command/response . 39
7.11.4 REJect (REJ) command/response . 39
7.11.5 Set Asynchronous Balanced Mode (SABM) command . 39
7.11.6 Disconnect Mode (DM) response . 39
7.11.7 Unnumbered Information (UI) command . 39
7.11.8 DISConnect (DISC) command . 40
7.11.9 Unnumbered ACK (UA) response . 40
8 Primitives . 40
8.1 Primitive types . 40
8.2 Primitives to the MAC layer (lower layer) . 40
8.3 Primitives to the NWK layer (higher layer) . 41
8.3.0 General . 41
8.3.1 Parameter definitions . 41
8.3.2 S-SAP primitives . 42
8.3.2.0 List of primitives . 42
8.3.2.1 DL_ESTABLISH primitive . 42
8.3.2.2 DL_RELEASE primitive . 43
8.3.2.3 DL_DATA primitive . 43
8.3.2.4 DL_UNIT_DATA primitive . 43
8.3.2.5 DL_SUSPEND primitive . 43
8.3.2.6 DL_RESUME primitive . 44
8.3.2.7 DL_ENC_KEY primitive . 44
8.3.2.8 DL_ENCRYPT primitive . 44
8.3.2.9 DL_SERVICE_MOD primitive . 45
8.3.3 B-SAP primitives . 45
8.3.3.0 List of primitives . 45
8.3.3.1 DL_BROADCAST primitive . 45
8.3.3.2 DL_EXPEDITED primitive . 45
8.4 Primitives to the interworking unit . 46
8.4.0 General . 46
8.4.1 Parameter definitions . 46
8.4.2 LU -SAP primitives . 46
X
8.4.2.0 List of primitives . 46
8.4.2.1 DL_U_DATA primitive . 46
8.4.2.2 DL_U_UNIT_DATA primitive . 47
8.4.2.3 DL_U_ERROR primitive . 47
9 C-plane peer-to-peer procedures . 47
ETSI
5 ETSI EN 300 175-4 V2.8.5 (2021-12)
9.1 General . 47
9.2 Point-to-point acknowledged operation. 48
9.2.1 Procedure for the use of the P/F bit . 48
9.2.1.1 Class A acknowledged information transfer . 48
9.2.1.2 Class B acknowledged information transfer . 48
9.2.2 Use of LLN . 48
9.2.2.1 Class A operation . 48
9.2.2.2 Class B operation . 48
9.2.3 Link establishment and information transfer in class A operation . 49
9.2.3.1 Establishing class A operation . 49
9.2.3.2 Class A acknowledged information transfer . 49
9.2.3.3 Transmission of class A I-frames . 50
9.2.3.4 Reception of class A I-frames . 50
9.2.3.5 Receiving acknowledgements . 50
9.2.3.6 Waiting for acknowledgement . 51
9.2.3.7 Release of class A operation . 51
9.2.3.8 Re-establishment of class A operation . 51
9.2.4 Establishing class B multiple frame operation . 52
9.2.4.1 Overview . 52
9.2.4.2 Class B multiple frame establishment procedures . 52
9.2.4.3 Class B LLN assignment procedures . 53
9.2.4.3.0 General . 53
9.2.4.3.1 PT establishment . 54
9.2.4.3.2 FT establishment . 54
9.2.5 Link maintenance and information transfer in class B multiple frame operation . 54
9.2.5.0 General . 54
9.2.5.1 Transmitting I-frames. 55
9.2.5.2 Receiving I-frames . 55
9.2.5.2.0 General . 55
9.2.5.2.1 P bit set to 1 . 55
9.2.5.2.2 P bit set to 0 . 55
9.2.5.3 Sending and receiving acknowledgements . 56
9.2.5.3.1 Sending acknowledgements . 56
9.2.5.3.2 Receiving acknowledgements . 56
9.2.5.4 Receiving REJ-frames . 56
9.2.5.5 Receiving RNR-frames . 57
9.2.5.6 LAPC own receiver busy condition . 58
9.2.5.7 Waiting acknowledgement . 59
9.2.5.8 Appropriate supervisory frame. 59
9.2.6 Release of class B multiple frame operation . 59
9.2.7 Link suspension and resumption . 60
9.2.7.1 Link suspension . 60
9.2.7.1.0 General . 60
9.2.7.1.1 Class B acknowledged suspend . 60
9.2.7.1.2 Unacknowledged suspend . 61
9.2.7.2 Class B link resumption . 62
9.2.7.3 Connection handover . 63
9.2.7.3.0 General . 63
9.2.7.3.1 Class A connection handover . 65
9.2.7.3.2 Class B connection handover . 65
9.2.7.3.3 Expiry of connection handover timer . 66
9.2.8 Re-establishment of class B multi-frame operation . 66
9.2.8.1 Criteria for re-establishment. 66
9.2.8.2 Procedure . 66
9.2.9 Exception handling . 67
9.2.9.1 General . 67
9.2.9.2 Class B exception condition reporting and recovery . 67
9.2.9.2.0 General . 67
9.2.9.2.1 N(S) sequence error . 67
9.2.9.2.2 N(R) sequence error . 68
9.2.9.2.3 Timer recovery condition . 68
9.2.9.2.4 Collision of identical transmitted and received commands . 68
ETSI
6 ETSI EN 300 175-4 V2.8.5 (2021-12)
9.3 Unacknowledged operation . 68
9.3.1 Use of LLN for unacknowledged information transfer . 68
9.3.2 Class U link establishment . 68
9.3.3 Unacknowledged information transfer . 68
9.3.3.1 Transmission of unacknowledged information . 68
9.3.3.2 Reception of unacknowledged information . 68
9.3.4 Unacknowledged release . 69
9.4 Broadcast operation . 69
9.4.1 Normal operation . 69
9.4.1.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.1.2 Procedure in the Portable radio Termination (PT) . 69
9.4.2 Expedited operation . 69
9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.2.2 Procedure in the Portable radio Termination (PT) . 70
9.5 MAC layer interfaces . 70
9.5.1 MC-SAP . 70
9.5.1.1 C-plane overview . 70
9.5.1.2 C-plane service data procedures . 70
9.5.1.3 U-plane service data . 71
9.5.2 MB-SAP . 71
9.5.2.0 General . 71
9.5.2.1 C-plane service data procedures . 71
9.5.2.2 U-plane service data . 72
9.5.3 MA-SAP . 72
9.5.3.1 Overview . 72
9.5.3.2 Service data procedures . 72
10 Management procedures. 72
10.1 Lower Layer Management Entity (LLME) . 72
10.2 MAC connection management . 73
10.2.0 General . 73
10.2.1 MAC connection set-up . 73
10.2.2 MAC connection release . 73
10.2.3 MAC connection modification . 74
10.2.4 MAC connection identifiers . 74
10.2.4.1 Overview . 74
10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 75
10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 75
10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75
10.2.5 Selection of logical channel (C or C ) . 75
S F
10.3 DLC C-plane (LAPC) management . 76
10.3.0 General . 76
10.3.1 Provision of link signature . 76
10.3.2 Routing of connection oriented links . 77
10.3.3 Routing of connectionless links . 77
10.4 DLC U-plane (LUX) management . 77
10.4.0 General . 77
10.4.1 U-plane establishment. 77
10.4.2 U-plane release . 78
10.4.3 U-plane suspend and resume . 78
10.5 Connection handover management . 78
10.6 Ciphering management . 79
10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 79
10.6.1.0 General . 79
10.6.1.1 Providing a key to the MAC layer . 79
10.6.1.2 Starting and stopping the ciphering . 79
10.6.1.3 Connection handover . 79
10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM
procedure . 80
10.7 Broadband data link management . 80
11 U-plane service characteristics . 80
ETSI
7 ETSI EN 300 175-4 V2.8.5 (2021-12)
11.1 General . 80
11.2 LU1 TRansparent UnProtected service (TRUP) . 81
11.3 LU2 Frame RELay service (FREL). 82
11.3.1 General . 82
11.3.2 Checksum operation . 83
11.3.3 Segmentation and transmission class . 83
11.3.4 Data transmission . 84
11.3.4.1 Send side procedure . 84
11.3.4.2 Receive side procedure . 84
11.4 LU3 Frame SWItching service (FSWI) . 84
11.5 LU4 Forward Error Correction (FEC) service. 85
11.6 LU5 Basic RATe adaption service (BRAT) . 85
11.6.1 Overview . 85
11.6.2 Protected service operation . 86
11.6.2.1 General . 86
11.6.2.2 Data buffering and initial rate adaptation . 87
11.6.2.3 Multi-channel set multiplexing . 88
11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 89
11.6.2.5 Frame sequencing and addition of control and fill octets . 90
11.6.2.6 Frame transmission . 91
11.6.3 Unprotected service operation . 91
11.6.3.1 General . 91
11.6.3.2 Data buffering and initial rate adaption . 92
11.6.3.3 Multi-channel set multiplexing . 92
11.6.3.4 Segmentation of MDUs . 93
11.6.3.5 Frame transmission . 93
11.7 LU6 Secondary RATe adaption (SRAT) service . 94
11.7.1 General . 94
11.8 LU16 ESCape Service (ESC) . 95
11.8.1 General . 95
11.9 LU7 64 kbit/s data bearer service .
...
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
2 ETSI EN 300 175-4 V2.9.1 (2022-03)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.
Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2022.
All rights reserved.
ETSI
3 ETSI EN 300 175-4 V2.9.1 (2022-03)
Contents
Intellectual Property Rights . 13
Foreword . 13
Modal verbs terminology . 13
1 Scope . 14
2 References . 14
2.1 Normative references . 14
2.2 Informative references . 15
3 Definition of terms, symbols and abbreviations . 16
3.1 Terms . 16
3.2 Symbols . 16
3.3 Abbreviations . 17
4 Data Link Control (DLC) layer overview . 19
4.1 General . 19
4.2 C-plane services . 20
4.3 U-plane services . 21
4.4 Lower Layer Management Entity (LLME) . 24
4.5 Instantiation in DLC U-plane . 24
5 C-plane service characteristics . 24
5.1 Data link service (LAPC+Lc) . 24
5.1.1 General . 24
5.1.2 LAPC types of operation . 25
5.1.3 Establishment of information transfer modes . 25
5.1.3.1 Data Link Identifier (DLI) . 25
5.1.3.2 LAPC states. 26
5.2 Broadcast service (Lb) . 26
6 Frame structures for C-plane services . 27
6.1 Data link service frame structure . 27
6.1.0 Frame format type FA. 27
6.1.1 General frame structure . 27
6.1.2 Lc frame delimiting and transparency . 28
6.1.3 Transmission order . 28
6.1.4 Routing to logical channels . 28
6.1.4.0 General . 28
6.1.4.1 CF/CLF logical channel . 29
6.1.4.2 C /CL logical channel . 29
S S
6.1.5 Invalid frames . 29
6.2 Broadcast service frame structure. 30
6.2.1 Standard frame structure . 30
6.2.2 Extended frame structure . 30
7 Elements of procedures and formats of fields for C-plane peer-to-peer communication . 31
7.1 General . 31
7.2 Address field formats . 31
7.3 Address field parameters . 31
7.3.1 REServed bit (RES) . 31
7.3.2 Command Response (C/R) bit . 31
7.3.3 SAPI field . 31
7.3.4 New Link Flag (NLF) bit . 32
7.3.5 LLN-field . 32
7.3.6 Data Link Identifiers (DLI) . 32
7.4 Control field formats . 33
7.5 Control field parameters . 33
7.5.1 Poll/Final (P/F) bit . 33
ETSI
4 ETSI EN 300 175-4 V2.9.1 (2022-03)
7.5.2 Multiple frame operation variables and sequence numbers . 33
7.5.2.1 Modulus . 33
7.5.2.2 Send state Variable V(S) . 34
7.5.2.3 Acknowledge state Variable V(A) . 34
7.5.2.4 Send sequence Number N(S) . 34
7.5.2.5 Receive state Variable V(R) . 34
7.5.2.6 Receive sequence Number N(R) . 34
7.5.3 Unacknowledged operation variables and sequence numbers . 34
7.5.4 Supervisory and Unnumbered function bits S and U . 34
7.6 Length indicator field format. 34
7.7 Length indicator field parameters . 35
7.7.1 Length indicator field extension bit (N) . 35
7.7.2 More data bit (M) . 35
7.7.3 Length parameter (L ) . 35
I
7.7.4 Extended length parameter (L ) . 36
JJ
7.7.5 Reserved bit (RES) . 36
7.8 Fill field format . 36
7.9 Checksum field format . 36
7.10 Checksum field parameters . 37
7.11 Commands and responses . 38
7.11.0 General . 38
7.11.1 Information (I) command . 38
7.11.2 Receive Ready (RR) command/response . 38
7.11.3 Receive Not Ready (RNR) command/response . 39
7.11.4 REJect (REJ) command/response . 39
7.11.5 Set Asynchronous Balanced Mode (SABM) command . 39
7.11.6 Disconnect Mode (DM) response . 39
7.11.7 Unnumbered Information (UI) command . 39
7.11.8 DISConnect (DISC) command . 40
7.11.9 Unnumbered ACK (UA) response . 40
8 Primitives . 40
8.1 Primitive types . 40
8.2 Primitives to the MAC layer (lower layer) . 40
8.3 Primitives to the NWK layer (higher layer) . 41
8.3.0 General . 41
8.3.1 Parameter definitions . 41
8.3.2 S-SAP primitives . 42
8.3.2.0 List of primitives . 42
8.3.2.1 DL_ESTABLISH primitive . 42
8.3.2.2 DL_RELEASE primitive . 43
8.3.2.3 DL_DATA primitive . 43
8.3.2.4 DL_UNIT_DATA primitive . 43
8.3.2.5 DL_SUSPEND primitive . 43
8.3.2.6 DL_RESUME primitive . 44
8.3.2.7 DL_ENC_KEY primitive . 44
8.3.2.8 DL_ENCRYPT primitive . 44
8.3.2.9 DL_SERVICE_MOD primitive . 45
8.3.3 B-SAP primitives . 45
8.3.3.0 List of primitives . 45
8.3.3.1 DL_BROADCAST primitive . 45
8.3.3.2 DL_EXPEDITED primitive . 45
8.4 Primitives to the interworking unit . 46
8.4.0 General . 46
8.4.1 Parameter definitions . 46
8.4.2 LUX-SAP primitives . 46
8.4.2.0 List of primitives . 46
8.4.2.1 DL_U_DATA primitive . 46
8.4.2.2 DL_U_UNIT_DATA primitive . 47
8.4.2.3 DL_U_ERROR primitive . 47
9 C-plane peer-to-peer procedures . 47
ETSI
5 ETSI EN 300 175-4 V2.9.1 (2022-03)
9.1 General . 47
9.2 Point-to-point acknowledged operation. 48
9.2.1 Procedure for the use of the P/F bit . 48
9.2.1.1 Class A acknowledged information transfer . 48
9.2.1.2 Class B acknowledged information transfer . 48
9.2.2 Use of LLN . 48
9.2.2.1 Class A operation . 48
9.2.2.2 Class B operation . 48
9.2.3 Link establishment and information transfer in class A operation . 49
9.2.3.1 Establishing class A operation . 49
9.2.3.2 Class A acknowledged information transfer . 49
9.2.3.3 Transmission of class A I-frames . 50
9.2.3.4 Reception of class A I-frames . 50
9.2.3.5 Receiving acknowledgements . 50
9.2.3.6 Waiting for acknowledgement . 51
9.2.3.7 Release of class A operation . 51
9.2.3.8 Re-establishment of class A operation . 51
9.2.4 Establishing class B multiple frame operation . 52
9.2.4.1 Overview . 52
9.2.4.2 Class B multiple frame establishment procedures . 52
9.2.4.3 Class B LLN assignment procedures . 53
9.2.4.3.0 General . 53
9.2.4.3.1 PT establishment . 54
9.2.4.3.2 FT establishment . 54
9.2.5 Link maintenance and information transfer in class B multiple frame operation . 54
9.2.5.0 General . 54
9.2.5.1 Transmitting I-frames. 55
9.2.5.2 Receiving I-frames . 55
9.2.5.2.0 General . 55
9.2.5.2.1 P bit set to 1 . 55
9.2.5.2.2 P bit set to 0 . 55
9.2.5.3 Sending and receiving acknowledgements . 56
9.2.5.3.1 Sending acknowledgements . 56
9.2.5.3.2 Receiving acknowledgements . 56
9.2.5.4 Receiving REJ-frames . 56
9.2.5.5 Receiving RNR-frames . 57
9.2.5.6 LAPC own receiver busy condition . 58
9.2.5.7 Waiting acknowledgement . 59
9.2.5.8 Appropriate supervisory frame. 59
9.2.6 Release of class B multiple frame operation . 59
9.2.7 Link suspension and resumption . 60
9.2.7.1 Link suspension . 60
9.2.7.1.0 General . 60
9.2.7.1.1 Class B acknowledged suspend . 60
9.2.7.1.2 Unacknowledged suspend . 61
9.2.7.2 Class B link resumption . 62
9.2.7.3 Connection handover . 63
9.2.7.3.0 General . 63
9.2.7.3.1 Class A connection handover . 65
9.2.7.3.2 Class B connection handover . 65
9.2.7.3.3 Expiry of connection handover timer . 66
9.2.8 Re-establishment of class B multi-frame operation . 66
9.2.8.1 Criteria for re-establishment. 66
9.2.8.2 Procedure . 66
9.2.9 Exception handling . 67
9.2.9.1 General . 67
9.2.9.2 Class B exception condition reporting and recovery . 67
9.2.9.2.0 General . 67
9.2.9.2.1 N(S) sequence error . 67
9.2.9.2.2 N(R) sequence error . 68
9.2.9.2.3 Timer recovery condition . 68
9.2.9.2.4 Collision of identical transmitted and received commands . 68
ETSI
6 ETSI EN 300 175-4 V2.9.1 (2022-03)
9.3 Unacknowledged operation . 68
9.3.1 Use of LLN for unacknowledged information transfer . 68
9.3.2 Class U link establishment . 68
9.3.3 Unacknowledged information transfer . 68
9.3.3.1 Transmission of unacknowledged information . 68
9.3.3.2 Reception of unacknowledged information . 68
9.3.4 Unacknowledged release . 69
9.4 Broadcast operation . 69
9.4.1 Normal operation . 69
9.4.1.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.1.2 Procedure in the Portable radio Termination (PT) . 69
9.4.2 Expedited operation . 69
9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.2.2 Procedure in the Portable radio Termination (PT) . 70
9.5 MAC layer interfaces . 70
9.5.1 MC-SAP . 70
9.5.1.1 C-plane overview . 70
9.5.1.2 C-plane service data procedures . 70
9.5.1.3 U-plane service data . 71
9.5.2 MB-SAP . 71
9.5.2.0 General . 71
9.5.2.1 C-plane service data procedures . 71
9.5.2.2 U-plane service data . 72
9.5.3 MA-SAP . 72
9.5.3.1 Overview . 72
9.5.3.2 Service data procedures . 72
10 Management procedures. 72
10.1 Lower Layer Management Entity (LLME) . 72
10.2 MAC connection management . 73
10.2.0 General . 73
10.2.1 MAC connection set-up . 73
10.2.2 MAC connection release . 73
10.2.3 MAC connection modification . 74
10.2.4 MAC connection identifiers . 74
10.2.4.1 Overview . 74
10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 75
10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 75
10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75
10.2.5 Selection of logical channel (C or C ) . 75
S F
10.3 DLC C-plane (LAPC) management . 76
10.3.0 General . 76
10.3.1 Provision of link signature . 76
10.3.2 Routing of connection oriented links . 77
10.3.3 Routing of connectionless links . 77
10.4 DLC U-plane (LUX) management . 77
10.4.0 General . 77
10.4.1 U-plane establishment. 77
10.4.2 U-plane release . 78
10.4.3 U-plane suspend and resume . 78
10.5 Connection handover management . 78
10.6 Ciphering management . 79
10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 79
10.6.1.0 General . 79
10.6.1.1 Providing a key to the MAC layer . 79
10.6.1.2 Starting and stopping the ciphering . 79
10.6.1.3 Connection handover . 79
10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM
procedure . 80
10.7 Broadband data link management . 80
11 U-plane service characteristics . 80
ETSI
7 ETSI EN 300 175-4 V2.9.1 (2022-03)
11.1 General . 80
11.2 LU1 TRansparent UnProtected service (TRUP) . 81
11.3 LU2 Frame RELay service (FREL). 82
11.3.1 General . 82
11.3.2 Checksum operation . 83
11.3.3 Segmentation and transmission class . 83
11.3.4 Data transmission . 84
11.3.4.1 Send side procedure . 84
11.3.4.2 Receive side procedure . 84
11.4 LU3 Frame SWItching service (FSWI) . 84
11.5 LU4 Forward Error Correction (FEC) service. 85
11.6 LU5 Basic RATe adaption service (BRAT) . 85
11.6.1 Overview . 85
11.6.2 Protected service operation . 86
11.6.2.1 General . 86
11.6.2.2 Data buffering and initial rate adaptation . 87
11.6.2.3 Multi-channel set multiplexing . 88
11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 89
11.6.2.5 Frame sequencing and addition of control and fill octets . 90
11.6.2.6 Frame transmission . 91
11.6.3 Unprotected service operation . 91
11.6.3.1 General . 91
11.6.3.2 Data buffering and initial rate adaption . 92
11.6.3.3 Multi-channel set multiplexing . 92
11.6.3.4 Segmentation of MDUs . 93
11.6.3.5 Frame transmission . 93
11.7 LU6 Secondary RATe adaption (SRAT) service . 94
11.7.1 General . 94
11.8 LU16 ESCape Service (ESC) . 95
11.8.1 General .
...
SLOVENSKI STANDARD
01-maj-2022
Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 4.
del: Plast krmiljenja podatkovnih povezav (DLC)
Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part
4: Data Link Control (DLC) layer
Ta slovenski standard je istoveten z: ETSI EN 300 175-4 V2.9.1 (2022-03)
ICS:
33.070.30 Digitalne izboljšane Digital Enhanced Cordless
brezvrvične telekomunikacije Telecommunications (DECT)
(DECT)
35.100.20 Podatkovni povezovalni sloj Data link layer
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 4: Data Link Control (DLC) layer
2 ETSI EN 300 175-4 V2.9.1 (2022-03)
Reference
REN/DECT-00354
Keywords
DECT, DLC, IMT-2000, mobility, radio, TDD,
TDMA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
Important notice
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If you find errors in the present document, please send your comment to one of the following services:
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If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
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Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.
Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2022.
All rights reserved.
ETSI
3 ETSI EN 300 175-4 V2.9.1 (2022-03)
Contents
Intellectual Property Rights . 13
Foreword . 13
Modal verbs terminology . 13
1 Scope . 14
2 References . 14
2.1 Normative references . 14
2.2 Informative references . 15
3 Definition of terms, symbols and abbreviations . 16
3.1 Terms . 16
3.2 Symbols . 16
3.3 Abbreviations . 17
4 Data Link Control (DLC) layer overview . 19
4.1 General . 19
4.2 C-plane services . 20
4.3 U-plane services . 21
4.4 Lower Layer Management Entity (LLME) . 24
4.5 Instantiation in DLC U-plane . 24
5 C-plane service characteristics . 24
5.1 Data link service (LAPC+Lc) . 24
5.1.1 General . 24
5.1.2 LAPC types of operation . 25
5.1.3 Establishment of information transfer modes . 25
5.1.3.1 Data Link Identifier (DLI) . 25
5.1.3.2 LAPC states. 26
5.2 Broadcast service (Lb) . 26
6 Frame structures for C-plane services . 27
6.1 Data link service frame structure . 27
6.1.0 Frame format type FA. 27
6.1.1 General frame structure . 27
6.1.2 Lc frame delimiting and transparency . 28
6.1.3 Transmission order . 28
6.1.4 Routing to logical channels . 28
6.1.4.0 General . 28
6.1.4.1 CF/CLF logical channel . 29
6.1.4.2 C /CL logical channel . 29
S S
6.1.5 Invalid frames . 29
6.2 Broadcast service frame structure. 30
6.2.1 Standard frame structure . 30
6.2.2 Extended frame structure . 30
7 Elements of procedures and formats of fields for C-plane peer-to-peer communication . 31
7.1 General . 31
7.2 Address field formats . 31
7.3 Address field parameters . 31
7.3.1 REServed bit (RES) . 31
7.3.2 Command Response (C/R) bit . 31
7.3.3 SAPI field . 31
7.3.4 New Link Flag (NLF) bit . 32
7.3.5 LLN-field . 32
7.3.6 Data Link Identifiers (DLI) . 32
7.4 Control field formats . 33
7.5 Control field parameters . 33
7.5.1 Poll/Final (P/F) bit . 33
ETSI
4 ETSI EN 300 175-4 V2.9.1 (2022-03)
7.5.2 Multiple frame operation variables and sequence numbers . 33
7.5.2.1 Modulus . 33
7.5.2.2 Send state Variable V(S) . 34
7.5.2.3 Acknowledge state Variable V(A) . 34
7.5.2.4 Send sequence Number N(S) . 34
7.5.2.5 Receive state Variable V(R) . 34
7.5.2.6 Receive sequence Number N(R) . 34
7.5.3 Unacknowledged operation variables and sequence numbers . 34
7.5.4 Supervisory and Unnumbered function bits S and U . 34
7.6 Length indicator field format. 34
7.7 Length indicator field parameters . 35
7.7.1 Length indicator field extension bit (N) . 35
7.7.2 More data bit (M) . 35
7.7.3 Length parameter (L ) . 35
I
7.7.4 Extended length parameter (L ) . 36
JJ
7.7.5 Reserved bit (RES) . 36
7.8 Fill field format . 36
7.9 Checksum field format . 36
7.10 Checksum field parameters . 37
7.11 Commands and responses . 38
7.11.0 General . 38
7.11.1 Information (I) command . 38
7.11.2 Receive Ready (RR) command/response . 38
7.11.3 Receive Not Ready (RNR) command/response . 39
7.11.4 REJect (REJ) command/response . 39
7.11.5 Set Asynchronous Balanced Mode (SABM) command . 39
7.11.6 Disconnect Mode (DM) response . 39
7.11.7 Unnumbered Information (UI) command . 39
7.11.8 DISConnect (DISC) command . 40
7.11.9 Unnumbered ACK (UA) response . 40
8 Primitives . 40
8.1 Primitive types . 40
8.2 Primitives to the MAC layer (lower layer) . 40
8.3 Primitives to the NWK layer (higher layer) . 41
8.3.0 General . 41
8.3.1 Parameter definitions . 41
8.3.2 S-SAP primitives . 42
8.3.2.0 List of primitives . 42
8.3.2.1 DL_ESTABLISH primitive . 42
8.3.2.2 DL_RELEASE primitive . 43
8.3.2.3 DL_DATA primitive . 43
8.3.2.4 DL_UNIT_DATA primitive . 43
8.3.2.5 DL_SUSPEND primitive . 43
8.3.2.6 DL_RESUME primitive . 44
8.3.2.7 DL_ENC_KEY primitive . 44
8.3.2.8 DL_ENCRYPT primitive . 44
8.3.2.9 DL_SERVICE_MOD primitive . 45
8.3.3 B-SAP primitives . 45
8.3.3.0 List of primitives . 45
8.3.3.1 DL_BROADCAST primitive . 45
8.3.3.2 DL_EXPEDITED primitive . 45
8.4 Primitives to the interworking unit . 46
8.4.0 General . 46
8.4.1 Parameter definitions . 46
8.4.2 LUX-SAP primitives . 46
8.4.2.0 List of primitives . 46
8.4.2.1 DL_U_DATA primitive . 46
8.4.2.2 DL_U_UNIT_DATA primitive . 47
8.4.2.3 DL_U_ERROR primitive . 47
9 C-plane peer-to-peer procedures . 47
ETSI
5 ETSI EN 300 175-4 V2.9.1 (2022-03)
9.1 General . 47
9.2 Point-to-point acknowledged operation. 48
9.2.1 Procedure for the use of the P/F bit . 48
9.2.1.1 Class A acknowledged information transfer . 48
9.2.1.2 Class B acknowledged information transfer . 48
9.2.2 Use of LLN . 48
9.2.2.1 Class A operation . 48
9.2.2.2 Class B operation . 48
9.2.3 Link establishment and information transfer in class A operation . 49
9.2.3.1 Establishing class A operation . 49
9.2.3.2 Class A acknowledged information transfer . 49
9.2.3.3 Transmission of class A I-frames . 50
9.2.3.4 Reception of class A I-frames . 50
9.2.3.5 Receiving acknowledgements . 50
9.2.3.6 Waiting for acknowledgement . 51
9.2.3.7 Release of class A operation . 51
9.2.3.8 Re-establishment of class A operation . 51
9.2.4 Establishing class B multiple frame operation . 52
9.2.4.1 Overview . 52
9.2.4.2 Class B multiple frame establishment procedures . 52
9.2.4.3 Class B LLN assignment procedures . 53
9.2.4.3.0 General . 53
9.2.4.3.1 PT establishment . 54
9.2.4.3.2 FT establishment . 54
9.2.5 Link maintenance and information transfer in class B multiple frame operation . 54
9.2.5.0 General . 54
9.2.5.1 Transmitting I-frames. 55
9.2.5.2 Receiving I-frames . 55
9.2.5.2.0 General . 55
9.2.5.2.1 P bit set to 1 . 55
9.2.5.2.2 P bit set to 0 . 55
9.2.5.3 Sending and receiving acknowledgements . 56
9.2.5.3.1 Sending acknowledgements . 56
9.2.5.3.2 Receiving acknowledgements . 56
9.2.5.4 Receiving REJ-frames . 56
9.2.5.5 Receiving RNR-frames . 57
9.2.5.6 LAPC own receiver busy condition . 58
9.2.5.7 Waiting acknowledgement . 59
9.2.5.8 Appropriate supervisory frame. 59
9.2.6 Release of class B multiple frame operation . 59
9.2.7 Link suspension and resumption . 60
9.2.7.1 Link suspension . 60
9.2.7.1.0 General . 60
9.2.7.1.1 Class B acknowledged suspend . 60
9.2.7.1.2 Unacknowledged suspend . 61
9.2.7.2 Class B link resumption . 62
9.2.7.3 Connection handover . 63
9.2.7.3.0 General . 63
9.2.7.3.1 Class A connection handover . 65
9.2.7.3.2 Class B connection handover . 65
9.2.7.3.3 Expiry of connection handover timer . 66
9.2.8 Re-establishment of class B multi-frame operation . 66
9.2.8.1 Criteria for re-establishment. 66
9.2.8.2 Procedure . 66
9.2.9 Exception handling . 67
9.2.9.1 General . 67
9.2.9.2 Class B exception condition reporting and recovery . 67
9.2.9.2.0 General . 67
9.2.9.2.1 N(S) sequence error . 67
9.2.9.2.2 N(R) sequence error . 68
9.2.9.2.3 Timer recovery condition . 68
9.2.9.2.4 Collision of identical transmitted and received commands . 68
ETSI
6 ETSI EN 300 175-4 V2.9.1 (2022-03)
9.3 Unacknowledged operation . 68
9.3.1 Use of LLN for unacknowledged information transfer . 68
9.3.2 Class U link establishment . 68
9.3.3 Unacknowledged information transfer . 68
9.3.3.1 Transmission of unacknowledged information . 68
9.3.3.2 Reception of unacknowledged information . 68
9.3.4 Unacknowledged release . 69
9.4 Broadcast operation . 69
9.4.1 Normal operation . 69
9.4.1.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.1.2 Procedure in the Portable radio Termination (PT) . 69
9.4.2 Expedited operation . 69
9.4.2.1 Procedure in the Fixed radio Termination (FT) . 69
9.4.2.2 Procedure in the Portable radio Termination (PT) . 70
9.5 MAC layer interfaces . 70
9.5.1 MC-SAP . 70
9.5.1.1 C-plane overview . 70
9.5.1.2 C-plane service data procedures . 70
9.5.1.3 U-plane service data . 71
9.5.2 MB-SAP . 71
9.5.2.0 General . 71
9.5.2.1 C-plane service data procedures . 71
9.5.2.2 U-plane service data . 72
9.5.3 MA-SAP . 72
9.5.3.1 Overview . 72
9.5.3.2 Service data procedures . 72
10 Management procedures. 72
10.1 Lower Layer Management Entity (LLME) . 72
10.2 MAC connection management . 73
10.2.0 General . 73
10.2.1 MAC connection set-up . 73
10.2.2 MAC connection release . 73
10.2.3 MAC connection modification . 74
10.2.4 MAC connection identifiers . 74
10.2.4.1 Overview . 74
10.2.4.2 Advanced MAC Connection Identifiers (AMCI) . 75
10.2.4.3 Basic MAC Connection Identifiers (BMCI) . 75
10.2.4.4 MAC Connection Endpoint Identifier (MCEI) . 75
10.2.5 Selection of logical channel (C or C ) . 75
S F
10.3 DLC C-plane (LAPC) management . 76
10.3.0 General . 76
10.3.1 Provision of link signature . 76
10.3.2 Routing of connection oriented links . 77
10.3.3 Routing of connectionless links . 77
10.4 DLC U-plane (LUX) management . 77
10.4.0 General . 77
10.4.1 U-plane establishment. 77
10.4.2 U-plane release . 78
10.4.3 U-plane suspend and resume . 78
10.5 Connection handover management . 78
10.6 Ciphering management . 79
10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure . 79
10.6.1.0 General . 79
10.6.1.1 Providing a key to the MAC layer . 79
10.6.1.2 Starting and stopping the ciphering . 79
10.6.1.3 Connection handover . 79
10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM
procedure . 80
10.7 Broadband data link management . 80
11 U-plane service characteristics . 80
ETSI
7 ETSI EN 300 175-4 V2.9.1 (2022-03)
11.1 General . 80
11.2 LU1 TRansparent UnProtected service (TRUP) . 81
11.3 LU2 Frame RELay service (FREL). 82
11.3.1 General . 82
11.3.2 Checksum operation . 83
11.3.3 Segmentation and transmission class . 83
11.3.4 Data transmission . 84
11.3.4.1 Send side procedure . 84
11.3.4.2 Receive side procedure . 84
11.4 LU3 Frame SWItching service (FSWI) . 84
11.5 LU4 Forward Error Correction (FEC) service. 85
11.6 LU5 Basic RATe adaption service (BRAT) . 85
11.6.1 Overview . 85
11.6.2 Protected service operation . 86
11.6.2.1 General . 86
11.6.2.2 Data buffering and initial rate adaptation . 87
11.6.2.3 Multi-channel set multiplexing . 88
11.6.2.4 Segmentation of Multiplexed Data Units (MDU) . 89
11.6.2.5 Frame sequencing and addition of control and fill octets . 90
11.6.2.6 Frame transmission . 91
11.6.3 Unprotected service operation . 91
11.6.3.1 General . 91
11.6.3.2 Data buffering and initial rate adaption .
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